在xcode 7.3.1中使用未解析标识符“GMSPlacesClient”

func searchBar(searchBar: UISearchBar,
    textDidChange searchText: String){

        let placesClient = GMSPlacesClient()
        placesClient.autocompleteQuery(searchText, bounds: nil, filter: nil) { (results, error:NSError?) -> Void in
            self.resultsArray.removeAll()
            if results == nil {
                return
            }
            for result in results!{
                if let result = result as? GMSAutocompletePrediction{
                    self.resultsArray.append(result.attributedFullText.string)
                }
            }
            self.searchResultController.reloadDataWithArray(self.resultsArray)
        }
}
func searchBar(searchBar: UISearchBar,
    text